up

app/src/main/java/io/legado/app/ui/chapterlist/ChapterListActivity.kt

@@ -27,9 +27,10 @@ class ChapterListActivity : VMBaseActivity<ChapterListViewModel>(R.layout.activi
     override fun onActivityCreated(savedInstanceState: Bundle?) {
         setSupportActionBar(toolbar)
         viewModel.bookUrl = intent.getStringExtra("bookUrl")
-        viewModel.loadBook()
-        view_pager.adapter = TabFragmentPageAdapter(supportFragmentManager)
-        tab_layout.setupWithViewPager(view_pager)
+        viewModel.loadBook {
+            view_pager.adapter = TabFragmentPageAdapter(supportFragmentManager)
+            tab_layout.setupWithViewPager(view_pager)
+        }
     }
 
     override fun onCompatCreateOptionsMenu(menu: Menu): Boolean {

app/src/main/java/io/legado/app/ui/chapterlist/ChapterListFragment.kt

@@ -45,14 +45,13 @@ class ChapterListFragment : VMBaseFragment<ChapterListViewModel>(R.layout.fragme
     }
 
     private fun initData() {
-        viewModel.bookDate.observe(viewLifecycleOwner, Observer {
-            loadBookFinish(it)
-        })
         viewModel.bookUrl?.let { bookUrl ->
             App.db.bookChapterDao().observeByBook(bookUrl).observe(viewLifecycleOwner, Observer {
                 adapter.setItems(it)
-                viewModel.bookDate.value?.let { book ->
-                    loadBookFinish(book)
+                viewModel.book?.let {
+                    durChapterIndex = it.durChapterIndex
+                    tv_current_chapter_info.text = it.durChapterTitle
+                    recycler_view.scrollToPosition(durChapterIndex)
                 }
             })
         }
@@ -66,18 +65,12 @@ class ChapterListFragment : VMBaseFragment<ChapterListViewModel>(R.layout.fragme
             }
         }
         tv_current_chapter_info.onClick {
-            viewModel.bookDate.value?.let {
+            viewModel.book?.let {
                 recycler_view.scrollToPosition(it.durChapterIndex)
             }
         }
     }
 
-    private fun loadBookFinish(book: Book) {
-        durChapterIndex = book.durChapterIndex
-        tv_current_chapter_info.text = book.durChapterTitle
-        recycler_view.scrollToPosition(durChapterIndex)
-    }
-
     override fun durChapterIndex(): Int {
         return durChapterIndex
     }
@@ -88,6 +81,6 @@ class ChapterListFragment : VMBaseFragment<ChapterListViewModel>(R.layout.fragme
     }
 
     override fun book(): Book? {
-        return viewModel.bookDate.value
+        return viewModel.book
     }
 }

app/src/main/java/io/legado/app/ui/chapterlist/ChapterListViewModel.kt

@@ -2,23 +2,21 @@ package io.legado.app.ui.chapterlist
 
 
 import android.app.Application
-import androidx.lifecycle.MutableLiveData
 import io.legado.app.App
 import io.legado.app.base.BaseViewModel
 import io.legado.app.data.entities.Book
 
 class ChapterListViewModel(application: Application) : BaseViewModel(application) {
-
-    var bookDate = MutableLiveData<Book>()
     var bookUrl: String? = null
+    var book: Book? = null
 
-    fun loadBook() {
+    fun loadBook(success: () -> Unit) {
         execute {
             bookUrl?.let {
-                App.db.bookDao().getBook(it)?.let { book ->
-                    bookDate.postValue(book)
-                }
+                book = App.db.bookDao().getBook(it)
             }
+        }.onSuccess {
+            success()
         }
     }
 }